Advection-Type Fan and a Frame Thereof

ABSTRACT

An advection-type fan includes a frame, an impeller and a cover plate. The frame has a bottom plate mounted with a shaft seat. The bottom plate has a lateral wall on a periphery thereof that surrounds the shaft seat. The lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion. An air inlet is formed between the air-guiding portion and the partitioning portion, and an air outlet is formed between the air-guiding portion and the air-separating portion. The partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet. The air-separating portion is arranged on the second end of the partitioning portion. The impeller is rotatably mounted on the shaft seat. The cover plate is disposed on a top of the lateral wall of the frame.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to an advection-type fan and a frame thereof and, more particularly, to an advection-type fan with radial incoming and outgoing airflows and a frame thereof.

2. Description of the Related Art

Referring to FIGS. 1 and 2, a conventional advection-type fan includes a frame 91, an impeller 92 and a cover plate 93. The frame 91 includes a bottom plate 911 mounted with a shaft seat 912. The bottom plate 911 includes an air inlet side 913 and an air outlet side 914 on two adjacent sides thereof, with an air-separating portion 915 located therebetween for separation. The bottom plate 911 further includes a lateral wall 916 extending therefrom, with the lateral wall 916 having two ends communicating with the air inlet side 913 and the air outlet side 914 respectively. The impeller 92 is rotatably mounted on the shaft seat 912. The cover plate 93 is disposed on the frame 91 and can be fixed on the tops of the air-separating portion 915 and the lateral wall 916 via a plurality of fixing members 94. In this arrangement, the impeller 92 can draw air via the air inlet side 913 and expel air via the air outlet side 914.

However, the air inlet side 913 and the air outlet side 914 are too close to each other as they are separated by only the air-separating portion 915. As a result, a portion of the air that is going to be expelled from the air outlet side 914 will be drawn back by the attraction of the air inlet side 913. Specifically, the air outlet side 914 has a specific area adjacent to the air-separating portion 915 where the air therein tends to be sucked back by the attraction of the air inlet side 913. This area is defined as a reverse airflow area Z as shown in FIG. 2. This phenomenon not only reduces the amount of air that can be exhausted from the air outlet side 914, but also causes turbulence due to mutual pushing between the incoming air of the air inlet side 913 and the drawn-back air from the reverse airflow area Z. This hinders the air from smoothly entering the air inlet side 913 and therefore reduces the amount of air that can enter the frame 91. Further, the air outlet side 914 of the frame 91 is completely laid open, which causes the air expelled from the air outlet side 914 to be spread everywhere. Disadvantageously, the expelled air can not be concentrated and a low air pressure is therefore resulted at the air outlet side 914.

SUMMARY OF THE INVENTION

It is therefore the primary objective of this invention to provide an advection-type fan and a frame thereof, in which the drawn air of an air inlet is separated from the expelled air of an air outlet to reduce the reverse airflows of the air outlet.

It is another objective of this invention to provide an advection-type fan and a frame thereof, in which an air outlet thereof is limited in a proper size to concentrate the expelled air.

The invention discloses an advection-type fan including a frame, an impeller and a cover plate. The frame has a bottom plate mounted with a shaft seat. The bottom plate has a lateral wall on a periphery thereof that surrounds the shaft seat. The lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion. An air inlet is formed between the air-guiding portion and the partitioning portion, and an air outlet is formed between the air-guiding portion and the air-separating portion. The partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet. The air-separating portion is arranged on the second end of the partitioning portion. The impeller is rotatably mounted on the shaft seat. The cover plate is disposed on a top of the lateral wall of the frame.

Furthermore, the invention discloses an advection-type fan including a frame, an impeller and a cover plate. The frame has a bottom plate mounted with a shaft seat. The bottom plate has a lateral wall on a periphery thereof that surrounds the shaft seat. The lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion. An air inlet is formed between the air-guiding portion and the partitioning portion, and an air outlet is formed between the air-guiding portion and the air-separating portion. The partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet. The air-separating portion is arranged on the second end of the partitioning portion. The impeller is rotatably mounted on the shaft seat. The cover plate is disposed on a top of the lateral wall of the frame. The frame is defined with a reference line that extends through the first and second ends of the partitioning portion, the frame is further defined with a datum line, a first auxiliary line and a second auxiliary line extended from the shaft seat thereof to the reference line, the datum line is perpendicular to the reference line, both the first and second auxiliary lines extend through and intersect with the reference line and are located further away from the first end of the partitioning portion than the datum line is, and the air-separating portion has an acute end located within an angle range between the first and second auxiliary lines.

Furthermore, the invention discloses an advection-type fan including a frame. The frame has a bottom plate mounted with a shaft seat. The bottom plate has a lateral wall on a periphery thereof that surrounds the shaft seat. The lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion. An air inlet is formed between the air-guiding portion and the partitioning portion, and an air outlet is formed between the air-guiding portion and the air-separating portion. The partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet. The air-separating portion is arranged on the second end of the partitioning portion. The air-separating portion has an acute end. The frame is defined with a datum line and an auxiliary line extended outwards from the shaft seat. The datum line extends through the second end of the partitioning portion and the auxiliary line extends through the air outlet. The acute end is located within an angle range between the datum line and the auxiliary line.

Still further, the invention discloses a frame of an advection-type fan including a bottom plate and a lateral wall. The bottom plate is mounted with a shaft seat. The lateral wall is arranged on a periphery of the shaft seat and surrounds the shaft seat. The lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion. An air inlet is formed between the air-guiding portion and the partitioning portion, and an air outlet is formed between the air-guiding portion and the air-separating portion. The partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet. The air-separating portion is arranged on the second end of the partitioning portion.

Still further, the invention discloses a frame of an advection-type fan including a bottom plate and a lateral wall. The bottom plate is mounted with a shaft seat. The lateral wall is arranged on a periphery of the shaft seat and surrounds the shaft seat. The lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion. An air inlet is formed between the air-guiding portion and the partitioning portion, and an air outlet is formed between the air-guiding portion and the air-separating portion. The partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet. The air-separating portion is arranged on the second end of the partitioning portion. The frame is defined with a reference line that extends through the first and second ends of the partitioning portion. The frame is further defined with a datum line, a first auxiliary line and a second auxiliary line extended from the shaft seat thereof to the reference line. The datum line is perpendicular to the reference line. Both the first and second auxiliary lines extend through and intersect with the reference line and are located further away from the first end of the partitioning portion than the datum line is. The air-separating portion has an acute end located within an angle range between the first and second auxiliary lines.

Still further, the invention discloses a frame of an advection-type fan including a bottom plate and a lateral wall. The bottom plate is mounted with a shaft seat. The lateral wall is arranged on a periphery of the shaft seat and surrounds the shaft seat. The lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion. An air inlet is formed between the air-guiding portion and the partitioning portion, and an air outlet is formed between the air-guiding portion and the air-separating portion. The partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet. The air-separating portion is arranged on the second end of the partitioning portion. The air-separating portion has an acute end. The frame is defined with a datum line and an auxiliary line extended outwards from the shaft seat. The datum line extends through the second end of the partitioning portion, the auxiliary line extends through the air outlet, and the acute end is located within an angle range between the datum line and the auxiliary line.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinafter and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 shows an exploded diagram of a conventional advection-type fan.

FIG. 2 is a top view of the conventional advection-type fan.

FIG. 3 shows an exploded diagram of an advection-type fan according to a first embodiment of the invention.

FIG. 4 is a top view of the advection-type fan of the first embodiment of the invention.

FIG. 5 shows relationships between the air pressure and the air-expelling capacity for both the conventional advection-type fan and the proposed advection-type fan of the first embodiment.

FIG. 6 is a top view of an advection-type fan according to a second embodiment of the invention.

In the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the term “first”, “second”, “third”, “fourth”, “inner”, “outer” “top”, “bottom” and similar terms are used hereinafter, it should be understood that these terms refer only to the structure shown in the drawings as it would appear to a person viewing the drawings, and are utilized only to facilitate describing the invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 3 and 4, an advection-type fan including a frame 1, an impeller 2 and a cover plate 3 is disclosed according to a first embodiment of the invention. The impeller 2 and the cover plate 3 are disposed on the frame 1. The impeller 2 is rotatably located between the frame 1 and the cover plate 3 for driving the air to flow.

The frame 1 includes a bottom plate 11 and a lateral wall 12. The bottom plate 11 has one face mounted with a shaft seat 111. The lateral wall 12 is formed on the face of the bottom plate 11 mounted with the shaft seat 111 and surrounds the shaft seat 111. The lateral wall 12 has an air-guiding portion 121, a partitioning portion 122 and an air-separating portion 123. The frame 1 further includes an air inlet 13 between the air-guiding portion 121 and the partitioning portion 122, as well as an air outlet 14 between the air-guiding portion 121 and the air-separating portion 123. The bottom plate 11 can be formed in any shape, such as a rectangle, a circle or any other irregular shapes. In this embodiment, the bottom plate 11 is in a rectangular shape, and the air inlet 13 and the air outlet 14 are located at two adjacent sides of the bottom plate 11.

The partitioning portion 122 includes a first end 1221 defining the air inlet 13 and a second end 1222 extending towards the air outlet 14 in a horizontal direction H. In such an arrangement, the drawn air of the air inlet 13 can be separated from the expelled air of the air outlet 14, thereby avoiding turbulence caused by mutual interference between the drawn and expelled airs. The air-separating portion 123 is arranged at the second end 1222 and has an acute end 1231 away from the second end 1222 of the partitioning portion 122 by a vertical distance d1 (in a vertical direction V perpendicular to the horizontal direction H) and a horizontal distance d2 (in the horizontal direction H). The acute end 1231 is more close to the shaft seat 111 and the air-guiding portion 121 than the second end 1222 is. The acute end 1231 defines the air-separating portion 123 as having a guiding face 1232 and a leeward face 1233, with the guiding face 1232 facing the air outlet 14 and the leeward face 1233 facing the first end 1221 of the partitioning portion 122. The guiding face 1232 may be tangent to the impeller 2 (namely, the guiding face 1232 may intersect with a periphery of the impeller 2 at only one line). In this arrangement, the guiding face 1232 may smoothly guide the air out of the advection-type fan via the air outlet 14 while the expelled air is prevented from being drawn back by the impeller 2.

An inner wall of the air-guiding portion 121 may form two air-guiding faces 1211 where it connects to the air inlet 13 and the air outlet 14, wherein the air-guiding faces 1211 gradually approaches the partitioning portion 122 as they extend to the air inlet 13 and the air outlet 14 respectively. In such an arrangement, the air-guiding faces 1211 can smoothly guide the air in and out of the frame 1. Specifically, one air-guiding face 1211 gradually approaches the partitioning portion 122 in the horizontal direction H as it extends to the air outlet 14, and the other air-guiding face 1211 gradually approaches the partitioning portion 122 in the vertical direction V as it extends to the air inlet 13.

Referring to FIG. 4, the frame 1 can be defined with a reference line H that extends through the first end 1221 and the second end 1222 of the partitioning portion 122. Furthermore, the frame 1 can be further defined with a datum line B₀, a first auxiliary line B₁ and a second auxiliary line B₂ extended from the shaft seat 111 to the reference line H, with the datum line B₀ being perpendicular to the reference line H. The first auxiliary line B₁ and the second auxiliary line B₂ extend through and intersect with the reference line H. In addition, the first auxiliary line B ₁ and the second auxiliary line B₂ are located further away from the first end 1221 of the partitioning portion 122 than the datum line B₀. A first included angle θ₁ is presented between the first auxiliary line B₁ and the datum line B₀. A second included angle θ₂ is presented between the second auxiliary line B₂ and the datum line B₀. The acute end 1231 of the air-separating portion 123 is located within an angle range between the first auxiliary line B₁ and the second auxiliary line B₂. The first included angle θ₁ may be 5 degrees and the second included angle θ₂ may be 35 degrees.

The impeller 2 is rotatably mounted on the shaft seat 111 of the frame 1. A motor may be used to drive the impeller 2 so that air can be drawn via the air inlet 13 and expelled via the air outlet 14. However, the invention is not characterized in using the motor to drive the impeller 2 as driving an impeller using an apparatus such as a motor is well-known in this art.

The cover plate 3 is disposed on a top of the frame 1 while covering the impeller 2. Specifically, the cover plate 3 can be fixed on a top of the lateral wall 12 through a plurality of fixing members 4.

Since the invention separates the air inlet 13 from the air outlet 14 by the partitioning portion 122 that extends from the first end 1221 to the second end 1222, the expelled air of the air outlet 14 can be efficiently separated from the drawn air of the air inlet 13, thereby avoiding the turbulence caused by interference therebetween. Further, the guiding face 1232 of the partitioning portion 122 can smoothly guide the air out of the frame 1 via the air outlet 14, preventing the expelled air of the air outlet 14 from being drawn back into the frame 1 by the impeller 2. As an advantage, the expelled air of the air outlet 14 is less likely to be drawn back by the attraction of the air inlet 13, reducing the chances of reverse airflows. Thus, the frame 1 will have smooth incoming and outgoing airflows, increasing the amount of air that can be drawn into and expelled from the frame 1.

Referring to FIG. 5, a data line L1 is shown to reflect the relationship between the air pressure and the air-expelling capacity of the conventional advection-type fan, whereas a data line L2 is shown to reflect the relationship between the air pressure and the air-expelling capacity of the advection-type fan of the invention. As can be seen in FIG. 5, the data shows that the partitioning portion 122 and the air-separating portion 123 can prevent the expelled air of the air outlet 14 from being drawn back into the frame 1 by the impeller 2. Especially, the partitioning portion 122 and the air-separating portion 123 can significantly reduce the reverse airflows at the air outlet 14 when the acute end 1231 is located within the angle range between the first auxiliary line B₁ and the second auxiliary line B₂. Thus, the advection-type fan of the invention does improve over the conventional advection-type fan in terms of air pressure and air-expelling capacity.

Referring to FIG. 6, a frame 5 including a bottom plate 51, a shaft seat 511, a lateral wall 52, an air-guiding portion 521, two air-guiding faces 5211, a partitioning portion 522, a first end 5221, a second end 5222, an air-separating portion 523, an acute end 5231, a guiding face 5232, a leeward face 5233, an air inlet 53 and an air outlet 54 is shown according to a second embodiment of the invention.

In contrast to the first embodiment, the bottom plate 51 in the second embodiment is in an irregular shape, and the air inlet 53 and the air outlet 54 are located at opposing sides of the bottom plate 51. To define a preferred location of the air-separating portion 523 when the bottom plate 51 is in the irregular shape, a datum line B₀ and an auxiliary line B₃ may be extended outwards from the shaft seat 511. The datum line B₀ extends through the second end 5222 of the partitioning portion 522 and the auxiliary line B₃ extends through the air outlet 54. An included angle θ is presented between the auxiliary line B₃ and the datum line B₀. The acute end 5231 of the air-separating portion 523 is located within an angle range between the datum line B₀ and the auxiliary line B₃ to reduce the reverse airflows at the air outlet 54. The included angle θ may be 45 degrees.

As stated above, the invention disposes the partitioning portion 122, 522 and the air-separating portion 123, 523 between the air inlet 13, 53 and the air outlet 14, 54. Thus, the partitioning portion 122, 522 can efficiently separate the expelled air of the air outlet 14, 54 from the drawn air of the air inlet 13, 53, thus avoiding the turbulence caused by interference between the drawn and expelled airs. Furthermore, the air-separating portion 123, 523 can smoothly guide the air out of the advection-type fan via the air outlet 14, 54 while the expelled air is prevented from being drawn back into the advection-type fan by the impeller 2. In this way, the invention can avoid the expelled air of the air outlet 14, 54 from being disturbed by the attraction of the air inlet 13, 53, thus reducing the reverse airflows, avoiding the turbulence and improving the air pressure and the air-expelling capacity.

Moreover, disposition of the air-separating portion 123, 523 can properly change the size and structure of the air outlet 14, 54, restricting the expelled air of the air outlet 14, 54 from spreading everywhere. Thus, the expelled air can be concentrated and the air pressure and the air-expelling capacity are also increased.

Although the invention has been described in detail with reference to its presently preferable embodiment, it will be understood by one of ordinary skill in the art that various modifications can be made without departing from the spirit and the scope of the invention, as set forth in the appended claims. 

1. An advection-type fan, comprising: a frame having a bottom plate mounted with a shaft seat, wherein the bottom plate has a lateral wall on a periphery thereof that surrounds the shaft seat, the lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion, an air inlet is formed between the air-guiding portion and the partitioning portion, an air outlet is formed between the air-guiding portion and the air-separating portion, the partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet, and the air-separating portion is arranged on the second end of the partitioning portion; an impeller rotatably mounted on the shaft seat; and a cover plate disposed on a top of the lateral wall of the frame.
 2. The advection-type fan as claimed in claim 1, wherein the air-separating portion has an acute end away from the second end of the partitioning portion by a vertical distance and is more close to the shaft seat than the second end is.
 3. The advection-type fan as claimed in claim 2, wherein the acute end is away from the second end of the partitioning portion by a horizontal distance and is more close to the air-guiding portion than the second end is.
 4. The advection-type fan as claimed in claim 2, wherein the acute end defines the air-separating portion as having a guiding face and a leeward face, with the guiding face facing the air outlet and the leeward face facing the first end of the partitioning portion.
 5. The advection-type fan as claimed in claim 4, wherein the guiding face is tangent to the impeller.
 6. The advection-type fan as claimed in claim 1, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air inlet, and the air-guiding face gradually approaches the partitioning portion in a vertical direction as the air-guiding face extends to the air inlet.
 7. The advection-type fan as claimed in claim 1, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air outlet, and the air-guiding face gradually approaches the partitioning portion in a horizontal direction as the air-guiding face extends to the air outlet.
 8. A frame of an advection-type fan, comprising: a bottom plate mounted with a shaft seat; and a lateral wall arranged on a periphery of the shaft seat and surrounding the shaft seat, wherein the lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion, an air inlet is formed between the air-guiding portion and the partitioning portion, an air outlet is formed between the air-guiding portion and the air-separating portion, the partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet, and the air-separating portion is arranged on the second end of the partitioning portion.
 9. The frame of the advection-type fan as claimed in claim 8, wherein the air-separating portion has an acute end that is away from the second end of the partitioning portion by a vertical distance and is more close to the shaft seat than the second end is.
 10. The frame of the advection-type fan as claimed in claim 9, wherein the acute end is away from the second end of the partitioning portion by a horizontal distance and is more close to the air-guiding portion than the second end is.
 11. The frame of the advection-type fan as claimed in claim 9, wherein the acute end defines the air-separating portion as having a guiding face and a leeward face, with the guiding face facing the air outlet and the leeward face facing the first end of the partitioning portion.
 12. The frame of the advection-type fan as claimed in claim 8, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air inlet, and the air-guiding face gradually approaches the partitioning portion in a vertical direction as the air-guiding face extends to the air inlet.
 13. The frame of the advection-type fan as claimed in claim 8, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air outlet, and the air-guiding face gradually approaches the partitioning portion in a horizontal direction as the air-guiding face extends to the air outlet.
 14. An advection-type fan, comprising: a frame having a bottom plate mounted with a shaft seat, wherein the bottom plate has a lateral wall on a periphery thereof that surrounds the shaft seat, the lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion, an air inlet is formed between the air-guiding portion and the partitioning portion, an air outlet is formed between the air-guiding portion and the air-separating portion, the partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet, and the air-separating portion is arranged on the second end of the partitioning portion; an impeller rotatably mounted on the shaft seat; and a cover plate disposed on a top of the lateral wall of the frame, wherein the frame is defined with a reference line that extends through the first and second ends of the partitioning portion, the frame is further defined with a datum line, a first auxiliary line and a second auxiliary line extended from the shaft seat thereof to the reference line, the datum line is perpendicular to the reference line, both the first and second auxiliary lines extend through and intersect with the reference line and are located further away from the first end of the partitioning portion than the datum line is, and the air-separating portion has an acute end located within an angle range between the first and second auxiliary lines.
 15. The advection-type fan as claimed in claim 14, wherein the first auxiliary line has an angle of 5 degrees with respect to the datum line.
 16. The advection-type fan as claimed in claim 14, wherein the second auxiliary line has an angle of 35 degrees with respect to the datum line.
 17. The advection-type fan as claimed in claim 14, wherein the acute end is away from the second end of the partitioning portion by a vertical distance and is more close to the shaft seat than the second end is.
 18. The advection-type fan as claimed in claim 17, wherein the acute end is away from the second end of the partitioning portion by a horizontal distance and is more close to the air-guiding portion than the second end is.
 19. The advection-type fan as claimed in claim 18, wherein the acute end defines the air-separating portion as having a guiding face and a leeward face, with the guiding face facing the air outlet and the leeward face facing the first end of the partitioning portion.
 20. The advection-type fan as claimed in claim 19, wherein the guiding face is tangent to the impeller.
 21. The advection-type fan as claimed in claim 14, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air inlet, and the air-guiding face gradually approaches the partitioning portion in a vertical direction as the air-guiding face extends to the air inlet.
 22. The advection-type fan as claimed in claim 14, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air outlet, and the air-guiding face gradually approaches the partitioning portion in a horizontal direction as the air-guiding face extends to the air outlet.
 23. The advection-type fan as claimed in claim 14, wherein the bottom plate is in an irregular shape.
 24. A frame of an advection-type fan, comprising: a bottom plate mounted with a shaft seat; and a lateral wall arranged on a periphery of the shaft seat and surrounding the shaft seat, wherein the lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion, an air inlet is formed between the air-guiding portion and the partitioning portion, an air outlet is formed between the air-guiding portion and the air-separating portion, the partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet, and the air-separating portion is arranged on the second end of the partitioning portion, wherein the frame is defined with a reference line that extends through the first and second ends of the partitioning portion, the frame is further defined with a datum line, a first auxiliary line and a second auxiliary line extended from the shaft seat thereof to the reference line, the datum line is perpendicular to the reference line, both the first and second auxiliary lines extend through and intersect with the reference line and are located further away from the first end of the partitioning portion than the datum line is, and the air-separating portion has an acute end located within an angle range between the first and second auxiliary lines.
 25. The frame of the advection-type fan as claimed in claim 24, wherein the first auxiliary line has an angle of 5 degrees with respect to the datum line.
 26. The frame of the advection-type fan as claimed in claim 24, wherein the second auxiliary line has an angle of 35 degrees with respect to the datum line.
 27. The frame of the advection-type fan as claimed in claim 24, wherein the acute end is away from the second end of the partitioning portion by a vertical distance and is more close to the shaft seat than the second end is.
 28. The frame of the advection-type fan as claimed in claim 27, wherein the acute end is away from the second end of the partitioning portion by a horizontal distance and is more close to the air-guiding portion than the second end is.
 29. The frame of the advection-type fan as claimed in claim 28, wherein the acute end defines the air-separating portion as having a guiding face and a leeward face, with the guiding face facing the air outlet and the leeward face facing the first end of the partitioning portion.
 30. The frame of the advection-type fan as claimed in claim 24, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air inlet, and the air-guiding face gradually approaches the partitioning portion in a vertical direction as the air-guiding face extends to the air inlet.
 31. The frame of the advection-type fan as claimed in claim 24, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air outlet, and the air-guiding face gradually approaches the partitioning portion in a horizontal direction as the air-guiding face extends to the air outlet.
 32. The frame of the advection-type fan as claimed in claim 24, wherein the bottom plate is in an irregular shape.
 33. An advection-type fan, comprising: a frame having a bottom plate mounted with a shaft seat, wherein the bottom plate has a lateral wall on a periphery thereof that surrounds the shaft seat, the lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion, an air inlet is formed between the air-guiding portion and the partitioning portion, an air outlet is formed between the air-guiding portion and the air-separating portion, the partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet, and the air-separating portion is arranged on the second end of the partitioning portion; an impeller rotatably mounted on the shaft seat; and a cover plate disposed on a top of the lateral wall of the frame, wherein the air-separating portion has an acute end, the frame is defined with a datum line and an auxiliary line extended outwards from the shaft seat, the datum line extends through the second end of the partitioning portion, the auxiliary line extends through the air outlet, and the acute end is located within an angle range between the datum line and the auxiliary line.
 34. The advection-type fan as claimed in claim 33, wherein the datum line and the auxiliary line has an angle of 45 degrees therebetween.
 35. The advection-type fan as claimed in claim 33, wherein the acute end is away from the second end of the partitioning portion by a vertical distance and is more close to the shaft seat than the second end is.
 36. The advection-type fan as claimed in claim 35, wherein the acute end is away from the second end of the partitioning portion by a horizontal distance and is more close to the air-guiding portion than the second end is.
 37. The advection-type fan as claimed in claim 36, wherein the acute end defines the air-separating portion as having a guiding face and a leeward face, with the guiding face facing the air outlet and the leeward face facing the first end of the partitioning portion.
 38. The advection-type fan as claimed in claim 37, wherein the guiding face is tangent to the impeller.
 39. The advection-type fan as claimed in claim 33, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air inlet, and the air-guiding face gradually approaches the partitioning portion in a vertical direction as the air-guiding face extends to the air inlet.
 40. The advection-type fan as claimed in claim 33, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air outlet, and the air-guiding face gradually approaches the partitioning portion in a horizontal direction as the air-guiding face extends to the air outlet.
 41. The advection-type fan as claimed in claim 33, wherein the bottom plate is in an irregular shape.
 42. A frame of an advection-type fan, comprising: a bottom plate mounted with a shaft seat; and a lateral wall arranged on a periphery of the shaft seat and surrounding the shaft seat, wherein the lateral wall has an air-guiding portion, a partitioning portion and an air-separating portion, an air inlet is formed between the air-guiding portion and the partitioning portion, an air outlet is formed between the air-guiding portion and the air-separating portion, the partitioning portion comprises a first end defining the air inlet and a second end extending towards the air outlet, and the air-separating portion is arranged on the second end of the partitioning portion, wherein the air-separating portion has an acute end, the frame is defined with a datum line and an auxiliary line extended outwards from the shaft seat, the datum line extends through the second end of the partitioning portion, the auxiliary line extends through the air outlet, and the acute end is located within an angle range between the datum line and the auxiliary line.
 43. The frame of the advection-type fan as claimed in claim 42, wherein the datum line and the auxiliary line has an angle of 45 degrees therebetween.
 44. The frame of the advection-type fan as claimed in claim 42, wherein the acute end is away from the second end of the partitioning portion by a vertical distance and is more close to the shaft seat than the second end is.
 45. The frame of the advection-type fan as claimed in claim 44, wherein the acute end is away from the second end of the partitioning portion by a horizontal distance and is more close to the air-guiding portion than the second end is.
 46. The frame of the advection-type fan as claimed in claim 45, wherein the acute end defines the air-separating portion as having a guiding face and a leeward face, with the guiding face facing the air outlet and the leeward face facing the first end of the partitioning portion.
 47. The frame of the advection-type fan as claimed in claim 42, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air inlet, and the air-guiding face gradually approaches the partitioning portion in a vertical direction as the air-guiding face extends to the air inlet.
 48. The frame of the advection-type fan as claimed in claim 42, wherein the air-guiding portion has an inner wall that forms an air-guiding face where it connects to the air outlet, and the air-guiding face gradually approaches the partitioning portion in a horizontal direction as the air-guiding face extends to the air outlet.
 49. The frame of the advection-type fan as claimed in claim 42, wherein the bottom plate is in an irregular shape. 